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 435 house representatives for each of the nation's 435 congressional districts. Each congressional district has a little over 700,000 people, and each district elects a representative to serve terms of 2 years in length. In general, the House and the Senate have an equal amount of legislative authority.