How to use "obligation" in a sentence

Instead of honoring this sacred obligation, America has given the Negro people a bad check, a check which has come back marked "insufficient funds."

The great body of the people abide by the dry legal obligation in both cases, and a few break over in each

This, I propose to offer, pledging that the larger purposes will bind upon us, bind upon us all as a sacred obligation with a unity of duty hitherto evoked only in times of armed strife.

She loved them as much as life itself, and she knew they truly wanted her with them; they were not inviting her out of a misguided sense of guilt and obligation

'After what Percival said to me this morning, I don't feel any obligation to him