What was the name of the island were most Europeans entered the US?

Through the Ellis Island Europeans entered the USA.

Explanation:

Situated at the inlet of Hudson River at the joining place of New Jersey and New York, Ellis Island served as the immigration station for many foreign countries since 1892-1954.

It has witnessed many foreign immigrants to enter the USA. Most of the immigrants were from Eastern and Southern Europe. Many other countries also entered through this island, such as - Britain, Germany, Ireland, few more from Northern and Eastern Europe and many more.

ellis island