The correct answer is option 2 i.e 1787.

• The Constitution of the United States is the supreme law of the United States of America.
  • The United States of America adopted a democratic constitution in 1787.
  • Constitution of America came into force in 1789.
  • 'We the People' are the first three words of the American constitution.
  • American constitution has been amended 27 times.
  • The first ten amendments are collectively known as the Bill of Rights.
  • The Continental Congress functioned as the provisional government of the United States From 1774 to 1781.
• Important features of the American constitution are:
  • Judicial review
  • Preamble
  • Fundamental Rights
  • Impeachment