The Bill of Rights is what protects us when we want to buy things.
Its called the castle doctrine
Why in God we trust?
The 84th Congress passed a joint resolution "declaring IN GOD WE TRUST the national motto of the United States". The resolution passed both the House and the Senate unanimously and without debate. The law was signed by President Eisenhower on July 30, 1956.
Because the amount of money in the world will change over time, the Constitution is never changing but the Congress changes every so often and knows what amount is appropriate for that time period. if that doesn't make sense I'm sorry it's a bit difficult to explain.