Which invention became readily available in the 1920s, drastically changed the american landscape, and became a pillar of the american economy?

What were the economic, religious and social/political factors in the abolition of slaves

Which conditions did austria demand of serbia after the assassination of archduke ferdinand? check all that apply. 1. swearing allegiance to the triple alliance 2. accepting responsibility for the assassination 3. turning over control of its military operations 4. surrendering half of its most fertile lands 5. suppressing anti-austrian groups and publications

What domestic issues did england and france have?