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.
The words Congress and House are sometimes used colloquially to refer to the House of Representatives. There are 535 members of Congress: 100 senators and 435 representatives in the House. Republicans currently control the Senate (54 to 44 Democrats) and the House (246 to 188).