The correct answer is:
Quantitative analysis and Qualitative analysis
Qualitative analysis is a research method which begins with more general open ended questions, moving towards greater precision as more information emerges.
Quantitative analysis assigns numerical values to the statements or observations, with the purpose of studying with statistical methods possible relationships between the variables and generalizing the results to a given population through sampling techniques.
The Battle of Leyte Gulf and The Battle of Midway
The bombing of Pearl Harbor brought the United States into WW2. The United States stayed out of the way until this event because it was the breaking point for the nation. America had been attacked without what they deemed was a good reason and hundreds had been killed and injured.
Germany annexed Austria, then the Sudetenland, and then invaded Czechoslovakia. This made Germany disliked by the allied powers. Germany invaded Poland for Danzig and then that is what pushed France and Britain into war with Germany. Later, Japan reached a stalemate in China, so they expanded their sphere of influence into the pacific. Japan invaded British Malaysia and joined the axis and signed the tripartite pact with Germany and Italy leaving Japan at war with France and the U.K. Japan also bombed Pearl Harbour making the U.S declare war on Japan, Germany then declared war on the U.S, I am not sure why they did this even though they did not have to.