Compare the British Navy of 1900 to the US. Navy today. Which is stronger?
In 1900 a Briton knew no country could invade or cause major damage to his cities. The enemy had to come by sea and we controlled it. No air war. No ICBMs. and no major terrorism. We were totally secure behind a line of Battleships no country could match. Bombardment of our coastal cities, and damage to our commerce were the only threats. A Briton slept soundly.
Technology has changed, and today any major US. City can be devastated by one ICBM. And there is nothing the US. Military can do about it. There is no defense to an ICBM. Sure, they can threaten destruction to an enemy who might attack, but mutually assured destruction seems to be lose, lose. And now we have terrorists, and they are not frightened of US. Nuclear missiles or aircraft carriers. They cause devastation with box cutters and airliners.
The US navy, army, marines, National Guard and air force cannot provide the kind of security the British navy did to its citizens. Its all technology I know, but a Briton got better protection.
So, The Royal Navy of 1900 was stronger than the entire US. Military of today.