Papermaking (50–121 AD) ...
Silk. ...
Tea Production (2737 BC) ...
Kites. ...
The Seed Drill (250 BC) ...
The best answer is <span>increased as more US troops went to fight in Vietnam.
LBJ's policy of "escalation", sending more troops and resources into Vietnam, started to quickly shift public opinion against the US presence in Vietnam. Although initially considered unpatriotic to protest the war, gradually more and more Americans began to oppose the war. </span>
Zimmermann telegram- Nothing like negotiating with a neighbor to invade their front lawn.
Unrestricted submarine warfare- Sinking ships owned by the US constantly is already making us angry.
and the sinking of the Lusitania- Now this wasn't the final straw but it did indeed shake US support for Germany and caused outrage all over the USA.
