Why were jim crow laws put in place, and why did opponents want to overturn the law

What impact did new technologies in the assembly and manufacturing have on the auto industry in the 1920s

How did the united states ironically create a slaverybased market economy and democratic political system?

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.