Which european county was the first to import enslaved africans to the americas?

Spain

Explanation:

Though Portugal was the first to buy slaves out of Africa, Spain was the first country to send them to America. In 1502, a Spaniard named Juan de Cordoba became the first merchant to send an African slave to America, and Spain soon began relying on African slaves for its labor in the New World

hello,

the steamboat is your answer.

it seems like its the only form of transportation on the choices.