This is an important decision, the most important one on abortion for decades.
There were two provisions of the law at issue. The first said that doctors have to have local admitting privileges at nearby hospitals, the second says that the clinics have to upgrade their facilities to hospital-like standards.
The law meant that there would be very few clinics providing abortion. In such an extremely large state the burden placed on women who would have trouble traveling hundreds of miles was a way of restricting any access to a legal abortion.