There are two houses of Congress being the House of Representatives and the Senate.
The Senate gives each state two senators which means that there are a 100 senators in the Senate.
The House of Representatives is based on the population of the state so states like California and Texas would have more representation here.
The U.S. Congress is modeled this way because the Founding fathers had different opinions when setting up the Legislature. Smaller states wanted equal representation and larger states wanted representation by size. They eventually compromised and came up with the two houses to satisfy both sides.
Some city states were monarchies ruled by kings or tyrants. Others were oligarchies ruled by a few powerful men on councils. The city of Athens invented the government of democracy and was ruled by the people for many years.
The best option from the list would be that "<span>b. The United States began to build up its military and to stockpile weapons," since this was part of the inevitable "Arms Race" that took place between the US and the USSR. </span>
