I assume u mean the French Revolution? the 1st Estate was the clergy / religious folk. they didn't have to pay the annual tax.
2nd Estate was the nobles
3rd Estate was the peasants and pretty much everyone else not a noble or a clergy.
set up courts
collect taxes
build roads
create banks
make and enforce laws
hold elections
take care of the health and safety of citizens
borrow money
spend money for the people
take private property for government
A. Spanish conquistadors bring their horses with them across the Atlantic. Some horses escape or swim to shore after a ship sinks. The Plains Indians become expert horsemen and buffalo hunters.
This was certainly not intentional since hardly the conquistadors would want their enemies to be stronger.
B. B. Rats are aboard European ships coming to the Americas. The rats spread disease and hunt unknown numbers of smaller animals to extinction.
This is hardly intentional. Rats were almost unavoidable back then and the Europeans just did not care much about them. They weren't thinking about how the rats would cause trouble in the Americas. They were "just rats".
So the only intentional one is:
C. Columbus brought pigs to the Americas on his second voyage. The pigs provided a valuable source of food for a growing population.
Columbus brought pigs for them to serve as food eventually and so they did.