6 is the answer because it is the most aproperate
Russia, Germany, Albania, and North Korea
Most dangerous lifestyle , few technological advances , dieseases spread easily
They fought over the moral issue of slavery.
Butt this is what google told me xD
They fought over many reasons like...
Industry vs. Farming. ...
States' Rights. The idea of states' rights was not new to the Civil War. ...
Expansion. As the United States continued to expand westward, each new state added to the country shifted the power between the North and the South. ...
Slavery. ...
Bleeding Kansas. ...
Abraham Lincoln. ...
Secession. ...
Activities.
A bycicle and/or a car which was invented by Henry Ford I don't know who invented the bycicle.