Answer:
a) The Lewis and Clark Expedition
Explanation:
The U.S. claim was based on the explorations of Lewis and Clark and on the establishment of trading posts set up by John Jacob Astor's Pacific Fur Company, such as Astoria at the mouth of the Columbia River. Great Britain based its claim, in part, on James Cook's exploration of the Columbia River.
Many aspects of Roman law and the Roman Constitution are still used today. These include concepts like checks and balances, vetoes, separation of powers, term limits, and regular elections.
Answer:
Paper money of uncertain value flooding the economy