American stocks grew from 15% of the global equity market in 1899 to a staggering 48% today. By contrast, the U.K., Germany and France have seen their market shares ebb. It serves as a good reminder not to invest solely in your home country. Canada, for example, makes up just 3.5% of the global market. In general, it’s best to divide your equities equally among Canadian, U.S. and overseas stocks to reduce the risk of being harmed by a regional slump.