Question

2. Who are the ultimate "deciders" of what's Constitutional? In other words,

who has the last word on whether laws follow the Constitution?

Answer 1

The Supreme Court and the justices therein are the "deciders" of whether or not a law is constitutional. They define and convey the meaning of the U.S. Constitution.

Step-by-step explanation:

Of the three branches, executive, legislative, and judicial, the Supreme Court is the top of the Judicial branch and the job given to them is understanding the Constitution.