Explain how both the earth tilted on its axis and the earth's revolution around the sun causes each season.

This is a really good site:
https://spaceplace.nasa.gov/seasons/en/

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years

Answerglycogen;