Guns, Germs and Steel by Jared Diamond is an interesting look at the factors leading to the 19th century pre-eminence of the west. Takes into account historical, anthropological, and geographic evidence from all corners of the globe.
The Birth of the Modern World by C.A. Bayly takes a comprehensive look at the time period between the French Revolution and World War 1 and does so on a Global scale taking into account aspects of world history outside of a western perspective. Very interesting chapter about the haitian slave revolt and Toussaint Louverture.
If you have access to a University library, or know any history majors, see if you can score a reading list or textbook from a 1st year 'Roots of World Civilization' or similar survey course. Textbooks aren't the most fun, but they cover a shit ton of information, usually in a fairly compressed format.
Abebooks is a great website. Everything is dirt cheap and ships internationally. Just do a search for 'world history' or whatever you're interested in: http://www.abebooks.com/servlet/SearchResults?kn=world+history&sts=t&x=0&y=0
It saddens me to hear about a still divided Spain.
I have a link here - in case it interests you - with scans from a stamp collection from spain starting way before the civil war and ending after it. There are all kinds of jewels in there that have to do with the civil war like stamps being re-valued/ rebranded by one political party and then another (putting your own mark on a stamp from fascist to communist or whatever) and I even believe stamps being used as pamphlets - but that one could be in the russian collection. It used to be my grandfathers collection and he collected both.
Anyway part of the war can be seen in this collection - if it interests you but sometimes it is hard to find.