When was the american constitution written?

It was written in 1787. Check this site for a lot of information about the Constitution.

http://en.wikipedia.org/wiki/United_States_Constitution

The American Constitution was written and adopted in 1787. To find the answer to this question, you can follow these steps:

1. Start by conducting a basic internet search using a reliable search engine like Google or Bing.
2. Type in the phrase "When was the American Constitution written?" in the search bar.
3. Look for reputable and trusted sources such as official government websites, educational institutions, or well-known historical resources.
4. Click on the search results that provide information about the origin and history of the American Constitution.
5. Scan the content of the sources to find the exact year mentioned.

By following these steps, you should be able to quickly find the answer to when the American Constitution was written.