At the time, the Lousiana Purchase doubled the size of the United States giving her power and resources(land, water, trade routes, minerals). It also gave America access to the ports in the area greatly aiding trade. The land had belonged to France before it was sold to America, so the purchase removed their presence in the area for the most part. It also fixed ties with France who had previously asked for aid in the French Revolution to which America said no; giving France money in the form of this purchase healed the connection slightly.
The Oregon territory officially belonged to Britain, but was mostly inhabited by Native Americans. It was a very large area that caused many disputes between the European colonists due to the fur-trade. America gained the land (segments of present-day Idaho, Oregon, Washington, Wyoming, and Montana) in 1859 when Oregon officially became a state. Many Native Americans were also sent here as America continued to gain territory. The giving over of the land was used to settle the boundary dispute between America and Britain.
B. The Nazi invasion of Poland drew England and France into war against Germany.
Congress gives POTUS (President of the United States) 10 days to review a bill, If Congress adjourns during the 10 day period ( and fails to designate an agent to deal with a POTUS' vetoing of a bill), the bill fails to become law (regardless of whether POTUS proactively vetoed the bill or nor).
Here are four ways it was effective:
A. Higher Education Act which allowed more students to attend college from things such as Pell Grants and loans, etc.
B. It also included the Water Quality Act which started the testing of water for pollutants and bacteria in the water.
C. The Air Quality Act also set standards for industrial and auto emissions.
D. The Civil Rights Act outlawed segregation in all public places and facilities.