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.
But the number 435, which was set in 1911 when the population reached 92 million, is completely arbitrary. The Constitution does not stipulate an upper limit to the number of representatives in the House. We could just as easily have 535 or 835 members. Through some legislative sleight-of-hand following the 1920 census, the House decided, contrary to established practice, not to increase its size.