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.
Congressional districts for the United States House of Representatives are electoral divisions for the purpose of electing members of the House of Representatives. The number of voting seats in the House of Representatives is currently set at 435, with each one representing approximately 711,000 people. That number has applied since 1913, excluding a temporary increase to 437 after the admissions of Alaska and Hawaii. The total number of state members is capped by the Reapportionment Act of 1929