What was a major historical claim to oregon by the united states

a) the american army established forts along the regions major rivers by 1800
b) zebulon pike explores the willamette valley in 1803
c) american robert gray turning up the regions major river in 1792
d) john jacob astor discs discovered gold on the banks of the columbia river in 1818

The answer is; C) "American Robert Gray turning up the regions major river in 1792."

Option C, American Robert Gray turning up the regions major river in 1792, is the right answer.

Explanation:

For the thousand years, people have inhabited the land of Oregon. There were several Native American tribes when the Europeans arrived in the land. The Chinook, the Paiute, the Cayuse, the Nez Perce etc were some of the major tribes during this time. Though the European explorers were the first to spot the land, they did not set foot on land. However, both Britain and Spain claimed their authority over the land. It was in the year 1792 that Captain Robert Gray, an explorer from America came upon the River Columbia and called the river after the name of his ship.

william marbury filed suit against secretary of state james madison because madison refused to deliver the justice of the peace commission former president john adams awarded marbury under the organic act of 1801.

step-by-step explanation:

100%     = 120

1%= 120/100=   1.2

9%   = 1.2 x 9=     10.8

10.80 to the 120 to get $130.80