1. The Louisiana Purchase
2. Removal of President Adams' "midnight judges"
3. Sending U.S. Navy/Marines to fight the Barbary Pirates
4. Embargo Act of 1807
Here are some links that could prove helpful:
http://www.libertyclassroom.com/warpowers/
http://www.archives.gov/exhibits/charters/constitution_transcript.html
http://www.monticello.org/site/research-and-collections/embargo-1807
http://billofrightsinstitute.org/resources/educator-resources/lessons-plans/presidents/louisiana-purchase/
http://legal-dictionary.thefreedictionary.com/Midnight+Judges+Act