George Washington was the first president
World War II also involved Asia and Australia while World War I just affected the US and Europe.
A primary source gives us first-hand information. it states the automatic facts, and not what has been heard through a second-hand information (sencondary source). it provides information like: direct or firsthand evidence about an event, object, person, or work of art.
and examples are: eyewitness accounts, results of experiments, and statistical data
There was starting to be a conflict
A. A person with a higher income pays more money in taxes.
A progressive tax's percentage is dependent on what income bracket you are in. So if you are in a higher income bracket (you earn more) then you would pay a bigger percentage than someone in a lower income bracket. That is why it is a "progressive tax", because it gets progressively bigger.