I'm a little confused about this sentence.
I was reading an article which was going to be handled in my reading class, but I got stopped by this sentence.
And for your better understanding, this article is about a conflict between staying only Islamic and going along with economy development and Islam in Malaysia.
Here is the sentence with a bit of context:
In last month's elections, Terengganu's became the second state government to be wrested from Prime Minister Mahathir Mohamad's federal-ruling coalition by the Islamic party, Pas. And it's people like Johan who make more-secular Malaysians nervous, not to mention foreigners invested in Dr. Mahathir's vision of a country with a progressive economy and a Muslim majority.
(In this article, Johan insists on Malaysia staying only Islamic.)
Here's my question :
How am I supposed to understand the word "invested?"
Should I take it for a past participle or just a past verb?
And in the "not to mention~" part,
does the author mention two things : the foreigners and a Muslim majority?
Thanks for your help !