Which government action was intended to ensure that African Americans could exercise their Fifteenth Amendment rights?
A The Supreme Court decision in Sweatt v. Painter
B The executive order to desegregate the U. S. Army
C The passage of the Voting Rights Act of 1965
D The Supreme Court decision in Plessy v. Ferguson

What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity? they created the scientific method to outline how science should be conducted. they were able to find the orbit of a comet and predict the year of its return. they discovered the three newest planets--uranus, neptune, and pluto. they explained why objects appear to have color.