Place the following events associated with the lead-up to US involvement in World War I in chronological order.

1. The sinking of the Lusitania by a German submarine in 1915

2. The interception of the Zimmerman Telegram in 1917
3. The resumption of unrestricted submarine warfare by Germany in 1917
4. President Woodrow Wilson's decision to ask Congress for a declaration of war against Germany in 1917