Do I need to make a Bachelor's thesis to apply to a master's degree from a top 100 University in the world? So let me tell you my story: I studied Industrial and Systems Engineering in the 24th best university in my country, which is around number 1683 in the world. I am from Mexico and thankfully our government is eager to pay our full tuition if we are accepted to one of the best 200 Universities in the World to study a Master's Degree, mainly in engineering. 

My main challenge at this moment is to be accepted in a masters' program at an International University. My grades are good, I have a "promedio" of 92, which is pretty high, although not the highest of my class, and I had outstanding results in the professional test. Because of these results, I was exempted of having to do a bachelor's thesis. 


Should I sacrifice my opportunity of earning working experience to dedicate myself to make a good Thesis? I am eager to do so if I really need to.

Thanks a lot to the people that took the time to read this.
I've never been on an (academic) admissions committee, but I can hardly imagine that, instead of reading the title of still another bachelor thesis, I find "exempted by university from writing bachelor thesis because of my course performance near the top of class," and consider that a negative. So I don't think you should sweat that. In most fields, undergraduates are not expected to have done research prior to taking up graduate studies; exceptions, as I have learned here, include math where this appears to be more commonplace. For some of your target fields (eg, supply chain management), I know it isn't, or at least wasn't, as some of my research was arguably on the most theoretical end of it, but I had no relevant experience with it prior to writing my paper; but that could have changed. I don't know about the others. 

In terms of being accepted at a good school, the ranking of your alma mater is probably what I would worry about most. You'll need strong letters, ideally from people known internationally (check their publications; ask them). You should definitely approach someone from your U.S. experience for a letter.

Finally, your first, second, and last question (as well as part one of your question 4) are highly personal decisions that you are unlikely to get feedback on here. They are off-topic, and even if they weren't, I wouldn't ask such questions on an anonymous internet forum. Ask friends, family, any mentor, and yourself.