I believe the answer is: <span>The United States is a nation of immigrants.
This divide the main opinion regarding this matter into two main point of views.
On one side, they believe that immigration to united states should be left open since it's the foundation in which the economy of this country was built.
On the other side, they believe that immigration should be restricted since it took away a lot of job opportunities for poor people.</span>
A law requiring students to salute the flag.
Answer:
Tariffs
Explanation:
The Congress was not able to pass tariffs.
Answer: The choice of a submarine to either sink or float depends on the captain of that submarine. For a submarine to sink the captain just have to allow water to fill the water tank (lock), making the submarine more dense than the water it has displaced. For it to float, it just have to empty the water tank and allow air to fill it.
When a boat in a canal lock sank, the water level will rise, because the volume of the boat has displaced more water, and this displaced water will cause the water level to rise. The space occupied by an object in a water, is equal to the volume of water been displaced.
Selection bias
is a kind of error that occurs when the researcher decides who is going to be studied.