What is supremacy clause? Explain why this clause says and does

the Constitution, the laws of the United States and all treaties under the authority of the United States are deemed the supreme law of the land, meaning it overrides state constitutions and laws. It is the second clause of Article VI...The Supremacy Clause of the Constitution of the United States (Article VI, Clause 2), establishes that the Constitution, federal laws made pursuant to it, and treaties made under its authority, constitute the "supreme Law of the Land", and thus take priority over any conflicting state laws. It provides that state courts are bound by, and state constitutions subordinate to, the supreme law. However, federal statutes and treaties are supreme only if they do not contravene the Constitution.

Explanation:

. austria-hungary began seizing british colonies in africa.