What is the meaning of 国の母?

Question

I'm attempting to translate parts of my 完全マスター N2 textbook just for the practice, and even though I've already gotten past this section, the meaning of [国]{くに}の[母]{はは} still eludes me. I don't like using Google Translate, and I can't find it in my dictionary.

Also if you could critique my translation, that would be very helpful.

[国]{くに}の[母]{はは}に[電話]{でんわ}をかけた。[母]{はは}の[声]{こえ}を[聞]{き}いたとたん、[涙]{なみだ}があふれてきた。

"I spoke to my mother over the phone. The second I heard her voice, I started to sob with joy."

Answer 1

As shown in @choco's comment above, 「[国]{くに}」 in this context means "one's birthplace", "home province", etc. It is mostly used when one is staying far away from where one was born and raised but is still in the same country/nation.

When I am in another prefecture, I am sometimes asked 「国はどこ？」,「お国はどちらですか。」, etc. to which I reply 「[名古屋]{なごや}です」.

So, 「国の母」 means "my mother back home". You yourself are living away from that place/region now, but your mother is still there.