Can someone me according to international law of europe in the late 18th century, there were only three ways that britain could take possession of another country. what were they?

a) if the country was uninhabited, britain could claim and settle that country. in this case, it could claim ownership of the land.

b) if the country was already inhabited, britain could ask for permission from the indigenous people to use some of their land. in this case, britain could purchase land for its own use but could not steal the land of the indigenous people.

c) if the country was already inhabited, they could ignore the indigenous people on the land so long as they did not challenge their settlement.

d) if the country was inhabited, britain could take over the country by invasion and conquest; in other words, defeat that country in war. however, even after winning a war, britain would have to respect the rights of indigenous people.

e) if the country was already inhabited, they could ask the indigenous people on the land for permission to use some of their land. if the response was no, they then could use force to settle the land.