The most important historic inspiration of the US Constitution was the English "Magna Carta", the document drawn up by the English barons in 1215, and which set clear limits on the exercise of power by the ruler (in this case the monarch, King John), formalised the principles of government by consensus (parliamentary government), and established the fundamental rights of the individual.
This states that : "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear arms, shall not be infringed."
This, the most controversial of the Amendments in modern times, is the cause of intense attention by the two opposing camps in modern American society, those in favor of firearms legislation as a means to combat America's terrible record in homicides and armed crime (the homicide and armed crime rate in the USA is far far higher than those in other Western countries where the possession of arms is closely regulated, if not largely forbidden), and those who maintain that it is the "constitutional" right of any American to be allowed to carry arms even for personal use (nothing to do with a Militia for the purpose of State security).
Places limits on the rights of the state to enter or conduct seizures on private property.
These establish the civil rights of defendants in courts of law, including the rights to trial by jury, the rights to summon witnesses, and the limits on the power of the State or state prosecutors to set "unreasonable" levels of bail.
This underlines the fact that only certain powers in the United States are delegated to the federal government, and that all other power resides in the individual states and the people.
The Twelfth Amendment (ratified in 1804) determines the manner in which the President and Vice President of the USA are elected by "electors" nominated by the different states. The implications of this were illustrated in 2000 in the Bush / Gore election, and again in 2016 when Hillary Clinton won two million more popular votes than her rival Donald Trump who was elected as President by the electoral college. The President of the USA is NOT directly elected by universal suffrage, contrary to an often held popular belief.
The Thirteenth
Amendment (1865) banned slavery in the United States. It is a
historic curiosity that in spite of the Jeffersonian precept
that
"all men are born equal", slavery was banned in the USA long after it
was outlawed in most countries of Europe and their dependencies.
The
Fourteenth
Amendment, ratified in 1868, defines US citizenship
and
the manner in which states elect their Representatives to Congress.
However, it only applied to men, and it was not until the passing of
the nineteenth
amendment, in 1920, that women got the vote in
the
USA.
The twenty-second Amendment, passed in 1951, limited the number of terms of office that a president could serve, to two terms of four years each. Thus F.D.Roosevelt's record of getting elected to the US Presidency four times will never be beaten - unless the Constitution is changed again to allow this.
The US Constitution makes no mention of God.
On the other hand the national motto of the USA is "In God we trust", a motto that first appeared on US coins in 1864. It should be noted, however, that the motto does not define the word "God". Although religious practice, to this day, remains strong in the United States, and the USA is still essentially a Protestant nation - indeed a Non-Conformist and even puritanical nation - there is no established religion, no state religion in the USA, and the "God" in whom Americans trust can be any form of God, including God the Father in the Christian sense, Jehovah, Allah, Hindu deities, or even personal Gods or the Gods of the American Indians. No American can be barred from representative office because of his religious views, or the absence of them.
By contrast to the US Constitution, "God" is referred to in the State Constitutions of all but four of States. Six states still have articles in their State Constitutions that prohibit people who do not believe in God from holding public office; however these restrictions are not applied, and it is generally accepted that they are unconstitutional, according to the US Constitution.