TysLolakins thank you so much for your response, very informative I appreciate it. I meant there's someone here in GT (guy hence "Bro") who mentioned that he just visited his relatives in the US without any plans of relocation/migration at fist but convinced by his said relatives and was able to land a decent job there using a tourist visa.
I understand everything that you said, believe it or not, I've made tons of research already hinde lang sa US, pati Canada, Australia, NZ haha, and I am aware gaano kahirap to immigrate moreso to land a job using a tourist visa, hehe nagbabakasali lang may ibang side of the story na marinig dito.

With regards to my Sister, naisip ko lang she might be asked to provide or prove her financial standing, issue wala syang sariling house sa ngayon (renting), no properties aside from her car and she's divorced, no criminal records naman so far haha, and is staying in the US for almost a decade na, not sure of her knowledge of US history nga lang. But for now, she has no intensions of acquiring a Citizenship talaga, for her it is not imperative sa ngayon, because she feel na uuwe at uuwe naman sya sa Pinas when she retires, her kids are both independent naman, let's see kung magbago isip nya in the near future.
Pero kung mahirap/matagal din magpetition ng Sibling, di ko na din siguro sya i-advise pa to apply for Citizenship. I get what you mean maski dito sa Qatar, mahirap na din lahat, mahirap makapunta, mahirap maka land ng maayos na trabaho, mahirap tumagal, I can go on, paano pa kaya sa US?
Lol to divorcing my Husband, we just got married last April 2017. But yes, apparently that's the fastest way, though di din naman ganon kadali, my friend will be married to her American BF and I can only imagine how tedious the process will be too, since she has already started compiling her documents.