The answer is McCarthyism.
During this period, the U.S. was determine to prevent the spread of
communism in its territories.
Surveillance and warrantless arrest of suspects were rampant. Many lost their careers after being branded a
communist while others were put in jail.
Many criticized this actions as unconstitutional.
I'd say B. but i'm not sure. It could be D. aswell
Answer:
Methodist and Presbyterian missionaries established settlements
Lewis and Clark explored and mapped the interior.
John Jacob Astor made one of the first settlements.
Explanation:
The Oregon Territory was initially an extension of land owned by America until February 14th, 1859 when it was officially recognised as the State of Oregon and part of the Union.
Therefore, the three events that the United States used as a claim to the Oregon Territory are
Methodist and Presbyterian missionaries established settlements
Lewis and Clark explored and mapped the interior.
John Jacob Astor made one of the first settlements.
Commerce and Slave Trade Compromise is the answer
Hope That Helped!
