In Southeast Asia, the United States government used the domino theory to justify its support of a non-communist regime in South Vietnam against the communist government of North Vietnam, and ultimately its increasing involvement in the long-running Vietnam War (1954-75).
The number of voting representatives in the House is fixed by law at no more than 435, proportionally representing the population of the 50 states.
There are still 435 members of the House of Representatives a century later because of the Permanent Apportionment Act of 1929, which set that number in stone. The Permanent Apportionment Act of 1929 was the result of a battle between rural and urban areas of the United States following the 1920 Census.