What did commodore matthew perry's visits to japan in 1853 and 1854 and the open door policy of 1900 have in common?

One thing that  Commodore Matthew Perry's visits to Japan in 1853 and 1854 and the Open Door policy of 1900 had in common was that they were both meant to put international pressure on foreign nations--with the intent of opening up advantageous trade routes and relationships for the United States. 

Divide each number then subtract