The most common reasons are:

-Birth control (contraceptive) failure. Over half of all women who have an abortion used a contraceptive method during the month they became pregnant.5
-Inability to support or care for a child.
-To end an unwanted pregnancy.
-To prevent the birth of a child with birth defects or severe medical problems. Such defects are often unknown until routine second-trimester tests are done.
-Pregnancy resulting from rape or incest.
-Physical or mental conditions

Excluding reason 3 because it is a useless trusim ;-) presumably you must also believe that contraception failure, poverty, rape/incest and physical/mental conditions are 800% more common in the USA than in the Netherlands or Japan, since the abortion rate is 8 times as high.

Not expressing any opinion, just observing that much of the dogma relied on when discussing these issues is severely flawed.