The 16th Amendment gives Congress the power to collect taxes from incomes. Congress uses these taxes to build roads, manage construction, maintain public resources such as libraries, and keep an army.
No, he did not die from a gas bomb. He did go through a gas bomb when he fought in WWI but survived it.
He killed himself to prevent being caught when everyone was hunting him down after the WWII ended
Aconcagua Mountain at 6959 meters in height
The missisipi river formed western boundary