What type of category is the word yesterday?

What is the very first marine corp rank? Why did many Americans participate in the great migration? Where were the last 10 olympic games held? Are Arabs Asians? What type of clothing did they wear in Copenhagen during World War 2? When did merchants move into towns in medieval Europe? Who were the workers during the industrial revolution? What percentage of American Indians own phones? The national municipal league proposed ideas to end what problem? Result of exploration of christopher Columbus? How can I find names of Napoleon's Swiss Guard especially those who died at the Russian front? What are the qualification to be a senator rep or president? What new countries were formed from ottoman territories between 1817 and 1914? What does the fourth amendment prevent? What did the railroads do to make their schedules more standard? Why did Spain set up trading posts in Africa? What was conscription in World War 2? Did Apple buy Macintosh? How many games did baseball player Eddie Perez play as designated hitter for the Atlanta Braves in 1998? What method did Edward Hargraves use to find gold in Bathurst?