Can Pope use his Interdict power to force changes in national laws regarding abortion? I had once read in Church history about Rome's use of the Interdict power during the Protestant split, that is, to instruct the clergy of an entire nation to deny the Sacraments.  Rome's intended reaction was for the Catholic populace against their Protestant masters to instantly revolt and restore said nation to Catholicism.   Since Rome's attitude regarding abortion is well known, then why does't Rome get serious and use Interdict to deny the sacraments to all nations whose laws allow abortion, in order to force change?
In Roman Catholic canon law, an interdict is an ecclesiastical censure that excludes from certain rites of the Church individuals or groups, who nonetheless do not cease to be members of the Church. The pope can at any time choose to use his interdict powers to deny  the sacraments to all nations whose laws allow abortion. 

The widespread support of abortion rights is evident, for example, in the United States, which provides for legal abortions, and nearly every European country, with most countries in the European Union allowing abortion on demand during the first trimester. Were the pope to exclude the Catholic population of almost every country in the world from participation in Church rites, the Church could expect a backlash that might cause serious damage to the entire Church. So although the pope could interdict every country that did not fall into line, this is not a risk that a prudent pope would consider taking.