1. What are the years that Modern, Atomic, and Information Era began? 1.1 Did Modern era began in 1890? 1.2 When did Atomic era began? 1920 or 1930?, and when did it actually ends? 1.3 And which decade of the 20th Century did Information Era ushured? 60s, 70s, 80s, or 90s ? 2. Are tech and units represented in these eras correctly? In addition to MGs and AT Crew being misplaced. Are the guided missiles units placed in correct eras??