Answer:
I think the answer is California
Answer: americans extended the frontier when they learned about the territory from the expedition reports.
Explanation:
The expedition was significant as they discovered more than hundred specimen of biological plant life and animal kinds. They were welcomed and befriended by many native nevertheless a few had shown their unfriendliness towards them.
Their mission was to re-establish trade and business routes to India to declare American dominion.
The second one is the right one
The period which served as the foundation of the modern world would be from French Revolution to World War II. The amount of things which have changed in this time period was vital for all the changes that have followed ever since.