Brianilest large amounts of points what did southerns begin to build along Charleston harbor after Anderson and his men retreated to fort sumter?

Plz small sentence and what they built

In defiance of the Federal presence in Charleston Harbor, the Southerners rebuilt batteries and constructed new fortifications on Sullivan's Island, on Morris Island, and on James Island. When Anderson and his troops first entered Fort Sumter, the fort was far from complete.

Explanation:

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.