The first amendment prevents the Congress from making laws respecting an establishment of religion
National Liberation Front
Air causes The force of the moon pulls on earths waters
Tsunami a water wave almost the size of a tornato
Bonds are considered very low risk for the very simple reason that they are backed by the power of the credit of the United States.
So, the only REAL risk for investors is that the United States default on its debts, that is, that they don't pay their debts. This could happen if all foreign owned debts are called in at once.
