Plan A, which was to upgrade everything to Infantry and Artillery, isn't going to happen. It will cost 6000 gold for all of the upgrades. While we have 1900 gold in the bank, turning off the research slider only nets us another 200gpt. It will take 20 turns to upgrade everything, which just isn't worth it!
Our Grenadiers will do just fine against Roosevelt's Riflemen. The problem will be his Cavalry. So, I'm going to upgrade 2 Musketmen to Infantry to defend against any Cavalry incursion. I'm also going to upgrade our level 4 Maceman to Infantry. If we can get him to level 5 (another 7xp), we could then build West Point. And finally, I want to upgrade our 7 Catapults to Artillery. To do all of this, I will have to leave research turned off for 6 turns. We might ought to consider building Wall Street in the near future, but there are higher priorities at the moment.
Turn 251 (1705 AD)
Research begun: Electricity
Berlin begins: The Pentagon
I decide to reassign a couple of our scientists to engineers. This shaves 2 turns off of the Pentagon build (now due in 13 turns). I notice that we will pop another GP in 2 turns, with a 30% chance for another Great Artist (another reason to not build the Hermitage). I also notice that the Ironworks is still available to be built. Evidently, we did not build it as previously reported.
Turn 252 (1710 AD)
I've sent our Warrior over to have a look at Harappan. It is being defended by 5 Riflemen and a Cannon. No Cavalry! A look at New York shows 3 Cannons and 4 Cavalry ready to roll.
IBT:
Joseph Marie Jacquard (Great Engineer) born in Berlin
Turn 253 (1715 AD)
Our newest GE will grant us 900 hammers towards the Pentagon, which should be enough to finish it next turn. Merging him will get us 3 hpt, which will take 300 turns to get to 900. There are only 207 turns left in the game. The wild card is the 3 bpt from Representation. Honestly, I think the best use is to complete the Pentagon and start turning out 2 promotion troops, since we are about to go to war.
Oops. Bad math. We have 2 turns left on the Pentagon. I put the extra engineers back to work as scientists and MM the city for growth. We will still complete the Pentagon in 2 turns, but we will also grow in 2 turns.
And since we are about to be able to start producing troops again, upgrading our remaining Catapults is not as much of a priority. So, I decide to turn research back on.
We pick up a couple of negative modifiers from Saladin and Hatshepsut for declaring war on their friend, but they remain friendly with us. And since we are now at war, let's see if anyone will join us! Only Napoleon ...
The defenses of Philadelphia are reduced to RUBBLE
IBT:
While defending, Infantry defeats (14.80/20): American Cannon at 92.6 percent. 6xp till West Point
The fleet at Philadelphia sets sail. I'm not sure if that is good news or bad news. The city will definitely be razed now, but they could land the troops next to Berlin.
Turn 254 (1720 AD)
Let the battle of Philly begin ...
While attacking, Artillery loses to: American Rifleman (11.48/14) at 28.5 percent.
While attacking, Artillery loses to: American Rifleman (3.50/14) at 52.7 percent.
While attacking, Grenadier loses to: American Rifleman (2.52/14) at 67.3 percent.
While attacking, Grenadier defeats (9.36/12): American Rifleman at 71.2 percent.
While attacking, Grenadier defeats (4.56/12): American Rifleman at 86.7 percent.
While attacking, Grenadier defeats (10.68/12): American Rifleman at 86.7 percent.
While attacking, Infantry defeats (6.40/20): American Rifleman at 97.1 percent. 4xp remaining
While attacking, Grenadier defeats (6.24/12): American Rifleman at 100.0 percent.
While attacking, Catapult loses to: American Rifleman (1.82/14) at 57.1 percent.
While attacking, Grenadier defeats (12.00/12): American Rifleman at 100.0 percent.
Razed Philadelphia and capture a Worker in the process.
Now for all of those troops that came flooding across the border ...
While attacking, Artillery defeats (1.80/18): American Cavalry at 72.8 percent.
While attacking, Artillery defeats (18.00/18): American Grenadier at 95.0 percent.
While attacking, Artillery defeats (5.04/18): American Cavalry at 72.8 percent.
While attacking, Artillery defeats (1.80/18): American Cavalry at 73.2 percent.
While attacking, Artillery loses to: American Cavalry (2.10/15) at 87.1 percent.
While attacking, Artillery defeats (9.36/18): American Cavalry at 96.5 percent.
While attacking, Infantry loses to: American Cavalry (8.10/15) at 78.1 percent.
While attacking, Grenadier defeats (12.00/12): American Cavalry at 87.5 percent.
While attacking, Infantry defeats (11.00/20): American Cannon at 99.9 percent.
While attacking, Artillery defeats (18.00/18): American Cavalry at 100.0 percent.
And finally ...
The defenses of Atlanta are reduced to 45%
IBT:
Our sugar get pillaged, as well as the fishing nets of our spare clams.
A contingent, consisting of 5 Cavalry and 3 Cannons, are landed on the grassland cottage outside of Berlin.
Berlin grows: 21
Berlin finishes: The Pentagon
Turn 255 (1725 AD)
Berlin begins: Artillery
Now for Roosevelt's landing party ...
While attacking, Artillery loses to: American Cavalry (12.00/15) at 27.0 percent.
While attacking, Artillery defeats (0.90/18): American Cavalry at 56.9 percent.
While attacking, Artillery defeats (3.60/18): American Cavalry at 88.9 percent.
While attacking, Artillery defeats (9.90/18): American Cavalry at 51.5 percent.
While attacking, Grenadier defeats (8.28/12): American Cavalry at 86.3 percent.
While attacking, Artillery defeats (18.00/18): American Cavalry at 99.4 percent.
While attacking, Infantry defeats (17.60/20): American Cannon at 100.0 percent.
At this point, I'm running out of healthy and available troops!
While attacking, Catapult loses to: American Cannon (1.20/12) at 67.5 percent.
While attacking, Musketman defeats (5.58/9): American Cannon at 99.1 percent.
While attacking, Warrior loses to: American Cannon (1.20/12) at 94.7 percent. 
That Cannon only had 10 hit points.
While attacking, Spearman defeats (2.08/4): American Cannon at 100.0 percent. Well, not quite a Tank.
And finally ...
The defenses of Atlanta are reduced to 30%
IBT:
Our other clam gets pillaged. The city is now starving.
Meanwhile, 2 more Cavalry and 2 more Cannons cross the border.
Turn 256 (1730 AD)
Take a look at the power graph for the last 2 turns. We have definitely put some hurt onto FDR!
Now, let's take care of the troops he sent across the border ...
While attacking, Artillery loses to: American Cavalry (5.10/15) at 77.1 percent.
While attacking, Artillery defeats (9.36/18): American Cavalry at 95.6 percent.
While attacking, Grenadier defeats (11.28/12): American Cavalry at 99.8 percent.
While attacking, Grenadier defeats (6.00/12): American Cannon at 49.8 percent.
While attacking, Grenadier defeats (7.68/12): American Cannon at 86.1 percent.
And finally ...
The defenses of Atlanta are reduced to 15%
IBT:
Berlin finishes: Artillery
While defending, Musketman defeats (5.76/9): American Rifleman at 74.3 percent.
We have 3 votes for a PA, 1 against, and 1 abstension. The PA carries.
Turn 257 (1735 AD)
With Saladin owning the Hindu holy city, the fog of war is removed from a good part of the map.
Tech learned: Democracy
Tech learned: Communism
Tech learned: Combustion
Tech learned: Railroad
Tech learned: Rocketry
I ask Saladin to assist us with the 8 turns to research Electricity. It will now be done next turn!
Berlin begins: Destroyer
The defenses of Atlanta are reduced to RUBBLE
Turn 258 (1740 AD)
Research begun: Radio
Let the battle of Atlanta commence ...
While attacking, Artillery (3.6/18) withdraws from combat.
While attacking, Grenadier loses to: American Grenadier (5.76/12) at 69.9 percent.
While attacking, Grenadier loses to: American Rifleman (7.14/14) at 53.4 percent.

Evidently I did not bring enough troops to the party. It will take me a bit longer than it took Sherman, I guess.
IBT:
Berlin finishes: Destroyer
Turn 259 (1745 AD)
Berlin begins: Work Boat
IBT:
Berlin finishes: Work Boat
While defending, Grenadier defeats (9.96/12): American Cannon at 77.7 percent.
While defending, Grenadier loses to: American Grenadier (1.92/12) at 50.2 percent.
While defending, Grenadier defeats (10.80/12): American Rifleman at 47.8 percent.
While defending, Grenadier defeats (3.96/12): American Rifleman at 47.8 percent.
While defending, Grenadier defeats (6.24/12): American Rifleman at 47.8 percent.
While defending, Grenadier loses to: American Rifleman (14.00/14) at 2.8 percent.
Turn 260 (1750 AD)
Berlin begins: Artillery
Now, lets see about Atlanta again ...
While attacking, Artillery loses to: American Rifleman (8.40/14) at 64.0 percent.
While attacking, Grenadier loses to: American Rifleman (2.80/14) at 94.2 percent.
While attacking, Infantry defeats (16.40/20): American Grenadier at 99.9 percent. 3xp remaining
While attacking, Artillery defeats (18.00/18): American Rifleman at 99.9 percent.
While attacking, Grenadier defeats (12.00/12): American Cannon at 88.8 percent.
While attacking, Grenadier defeats (5.88/12): American Cannon at 89.0 percent.
While attacking, Artillery defeats (10.80/18): American Rifleman at 99.6 percent.
While attacking, Infantry defeats (17.40/20): American Cannon at 100.0 percent.
Razed Atlanta
No change in the border situation despite razing 2 cities. This is because of the culture bomb that FDR did in Harappan. Once that city is razed, the borders should move. Our troops need a few turns with the medic, but then they should be ready to go. We have 5 Artillery, 2 Infantry, and 3 Grenadiers. This should be more than enough to take the city.
Research into Radio will be done next turn. I suggest we grab Computers next for the Laboratory. Saladin has given us both horses and iron. We can probably go ahead and build the Ironworks, now. Sal has no coal, but will have a source once Harappan is razed.
Berlin will need to be MM'ed again next turn after our clams gets hooked up.