please help explain Federal Subject Matter jurisdiction.

Supreme Court case on venue, and how clauses in commercial contracts can trigger venue transfer issues.

http://www.scotusblog.com/case-files/cases/atlantic-marine-construction-co-v-united-states-district-court-for-the-western-district-of-texas/?wpmp_switcher=desktop

What was the issue in this case how does it relate to venue?What other venue-related cases can you find?