19. Which event led directly to the secession of south carolina from the union

Abolitionists were people who wanted to end the institution of slavery. Abraham Lincoln was the first president to be a part of the Republican Party. The victory of Abraham Lincoln in the Election of 1860 led directly to South Carolina's secession from the United States.

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offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

go up to your profile picture in the top right hand. click on it. then click on edit profile. there you shall see delete account