There were fewer transportation innovations because the rivers were plenty good transportation for farmers and their plantation. I hope I could help :D
One of things that was used to justify the caste system was "<span>aryan supremacy", since many of the people who were at the "bottom end" of the system were subjugated to racist policies. </span>
The Han dynasty <span>had great innovations in </span>metallurgy, particularly in <span>the development of </span>steel<span> and </span>wrought iron<span> by use of the </span>finery forge<span> and </span>puddling process<span>. </span>
Tear down the wall was spoken in West Berlin by Ronald Reagan for Gorbachev, the former Soviet Union's leader, to tear down the Berlin wall. Hope this helps!
