Which of the following nations did not join the League of Nations?

Following the Second World War, Germany was

The nation which took the lead in the eighteenth-century agricultural revolution was

The Second Battle of the Marne was

Following the Second World War, Germany was

The Munich Conference was

Catherine the Great of Russia

The Constitution of the United States of 1789

The nation which took the lead in the eighteenth-century agricultural revolution was

The Vietnam War