Why do they put In God We Trust on money?

Answer 1

It was printed first in 1865 that being the year the Civil War Ended..... It took 4 years of brother killing brother for us to understand that Man needs help being Governed..... It was printed in West Point NY.....

Correction

The motto first appeared in 1864, on the short-lived 2¢ coin. It was still due to the Civil War, but as an expression of faith that it might end soon, not because the war was already over.

Between 1866 and 1873 it was added to a number of other denominations. In a few cases, such as the nickel, it was later removed due to design considerations, but by 1938 it was permanently on all coin denominations.

During the 1950s the US was in the depths of the Cold War against the Soviet Union which was officially atheist. As a reaction to what was called by many "godless communism", Congress passed a resolution in 1955 that the motto should appear on paper money as well. The intent was to point out the significant difference between those societies and our more faith-based one.

The motto was put on $1 bills starting in 1957 as well as some 1935-G and H bills still being printed then despite their series date. In 1963 it was added to all other denominations.

There have been a number of lawsuits filed by groups opposed to the motto as a matter of separation of church and state. None ever succeeded but they've fueled a persistent set of urban legends that the motto is in imminent risk of being taken off any new or updated coin design. In reality the Mint has no plans whatsoever to remove it.