 Cancel Miranda was among those who participated in a school strike to this respect, two months before his graduation and was expelled from school.He then went to San Juan to finish high school.Puerto Ricans became U.S. citizens as a result of the 1917 Jones-Shafroth Act and those who were eligible, with the exception of women, were expected to serve in the military, either voluntarily or as a result of the military draft (conscription).