What was the most significant thing about napoleon’s new constitution?

It gave Napoleon full control of government.

Explanation:

This constitution was known as The Constitution of Year VIII, was approved in France on December 24th, 1799. One of its most notable features being the fact that it was conferred on Napoleon Bonaparte, who emerged during the French Revolution, the title of  First Consul, granting in practice powers similar to a dictator.

Another important aspect of this constitution is that it recognized the figure of universal suffrage, but in practice this was not fulfilled.

they usually pass federal laws

and sometimes in the elections of the president