Our Country
noun
You learned that 我が means "our", so our country is simply our country.
Just like 我が itself, this expression is somewhat old-fashioned and stylized. It comes up a lot in political discourse and other formal contexts.
わがくに
You learned this reading for 我 when you learned 我が. Just watch out for 国, which you might expect to rendaku here, but doesn't!
我が国の政治家の多くは男性だ。
Most of the politicians in our country are men.
我が国では、国民のワクチン接種の義務化が検討されています。
In our country, mandatory vaccination of the population is under consideration.
現在、在留資格のない外国人は、我が国への入国が認められておりません。
Currently, foreigners without resident status are not allowed to enter our country.