I'd think that one advantage of nationalism is the unity it builds among people who share the same nation, who start to think of each other as co-citizens.
One disadvantage of nationalism is the hate can be directed against outsiders.
The population of the US increased during these years is the correct answer.
As the representation in House of Representatives is based on population, the Congress increased the number of representatives accordingly with increase in population. In first House of Representatives of 1789, there were only 65 members which increased to 435 in 1913. The number is constant now due to the Permenant Apportionment Act of 1929 which fixed the number of seats at 435.
A) regulates the oil production and supply on the world's market
In the short term, the Organization of Petroleum-Exporting Countries (OPEC) has significant influence on the price of oil. ... For example, if OPEC countries are unsatisfied with the price of oil, it is in their interests to cut the supply of oil so prices rise.
Japan had attacked the United States, this incident is called Pearl Harbour. This is when bombers from aircraft carriers attacked US navy ships. This strategy was the same used by the US navy during an exercise. The casualties ranged to 1500 - 2000. On December 8, the United States declared war.