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.
If a state's population increases, that state's number of representatives can increase too. There were 59 members at the first session of the House of Representatives. Today there are 435 members. Representatives are elected to serve for a period of 2 years.