There's also the question of how accepted the Awakened are... I mean, using the 1800s as an example, the Salem Witch Trials were a bit over a century previous. While it isn't the religious expansion of previous eras, people probably wouldn't react kindly to spells and pointy ears popping up everywhere. Rewind to the era of the Inquisition, and we're seeing massive bloodshed and strife over the Awakening, something that would make the modern one look like a cake-walk in comparison. People are relatively accepting of the new and unknown nowadays, so tossing in what many would consider to be evil to their culture wouldn't go well in societies heavily influenced by Europe. That said, slavery could have been less of an issue at that point. A lot of the regions known for the slave trade had traditional beliefs, and their shamans could have made those kinds of activities... Unfeasible. A lot of the European expansionism could have been brought to a screeching halt as well... If the Aztecs knew spirits of fire and had a magical cure for the various diseases the conquistadors brought, would they have fallen to the thundersticks and plague the Spaniards brought? Would China have acquiesced to Britain's belligerency? I'm not even going to touch on the paranatural effects of the Awakening; the reintroduction of unicorns, behemoths roaming the USA, devil rats, hellhounds and barghests in peoples' homes, orichalcum, deepweed medications (or terror campaigns against it), the Infected, shedim, dragons...
That said, if a cabal of magic users get together, they'd utterly dominate whatever they choose to get into. Politics? Memory wiping spells, mind control/influence, mind probes, etc. Samaritan acts? Healing, using spells to provide shelter, etc. War? Invisibility, freedom of movement, spirits, water purification, healing, not to mention battle-spells (really, the least important of changes they'd bring). Communication is revolutionized by using spirit messengers or spells, magical medicine is a marvel, etc. It makes magic users a commodity to those willing to use them, and a nightmare to those opposed. It'd probably kickstart technological innovation in every field it touches, because mundane people would be afraid and want ways to compete/exceed magic.
By the way Senko, one percent isn't an opinion, its in the books. It's also a blanket one percent over everything from the guy who gets hives when near a mana-line to that insane, raving hobo driven mad by their talent to your average mage to your highly initiated immortal elf.