What is the supremacy clause? explain what this clause says and does.

The supremacy clause states that the constitution is the Supreme Law Of the land.

"This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding."

Explanation:

The supremacy clause ensures that none of the amendments or laws shall be violated by any person or group. It tells the American people and Government that all laws stated in the constitution must be followed under no circumstances.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.