Why was North Korea confident when it began the Korean War?

As the North Korean army pushed into Seoul, the South Korean capital, the United States readied its troops for a war against communism itself. At first, the war was a defensive one to get the communists out of South Korea, and it went badly for the Allies

Explanation:

during both period congress passed law restricting the civil liberties of american citizen that meet with the overall public support is the one statement that explain the rate scare of the 1920 and 1950 is very similar