During the early 1900s, most immigrants who arrived at Ellis Island were O detained for several days.
O released within hours.
O imprisoned for months.
O returned to their countries.

Released within hours

Explanation:

Despite the island's reputation as an "Island of Tears", the vast majority of immigrants were treated courteously and respectfully, and were free to begin their new lives in America after only a few short hours on Ellis Island. Only two percent of the arriving immigrants were excluded from entry.

Most Immigrants Arriving at Ellis Island in 1907 Were Processed in a Few Hours.

Explanation:

No passports or visas were needed to enter the United States through Ellis Island at this time

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.

the commander in chief