The answers are:
- Started a war with the Japanese
- Promoted interstate relations
- Made trade and travel safe
During the Pax Mongolica the Mongols managed to make the trade and travel safe through the Silk Road. Some of their rulers were promoting nice relations with the other states. But also they have started a war with Japan which ended with great loses for them and contributed to weakening their Empire.
True because it would lead United states into wars with countries they may not have planned to be at war with and there will be more united states citizens that our country man not be able to control.
D the soldiers became the villains of illustrated ballads
Colloquial? I think. Hope this helps