Which invention did Robert Fulton build? Question 3 options: steamboat cotton gin cotton spinning machine steam locomotive

Ithink it was the first election is which mass participation occurred. 

The founder of the byzantine  empire  and its first  emperor,  constantine  the great,  movedthe  capital of the roman empire  to the city of byzantium in 330 ce, and renamed it  constantinople.  constantine  the great also legalized christianity, which had previously been persecuted in the  roman empire.