Who was known as 'Black Moses' for leading hundreds of enslaved people to freedom?

Harriet Tubman

Which famous British boy band included members Zayn Malik, Harry Styles, and Louis Tomlinson? What iconic movie featured the villain Nurse Ratched? The capital city of Slovakia is? Which U.S. President authorized the Louisiana Purchase? What invincible star-shaped item grants Mario temporary power-up and invulnerability?