Question

on what charges was Louis XVI of France sentenced to death

Answer 1

It is sedition which means going against the authority,by unauthorized means such as in his case he secretly planned a meeting in Austria and Prussia to ambush/attack france.

Answer 2

there are three estates
1.clergy
2.nobality
3.third estate people
due to taking large amount of venue third estate people oppose in many ways and they sentence louis xvi to death
after sometime Napoleon rule on france