The intensifying international focus extends beyond technology. Century-old companies such as Coca-Cola Co. and Ford Motor Co. also are hoping to make more money in countries including China and India.
Few U.S. industries are tying their fortunes to overseas markets as aggressively as the technology sector, where new sources of revenue are often just a matter of equipping people with a computing device and an Internet connection.
Soaring sales of iPhones in China, Russia, India and Brazil during the April-June period helped Apple overcome softening demand for the device in the U.S. and Europe, where consumers seem to be more interested in waiting for the autumn release of a new iPhone that's expected to feature a larger screen.
Google generated 58 percent of its revenue outside the U.S. in its second quarter, the highest level yet for the Internet's most powerful company.
Facebook already gets 55 percent of its revenue overseas, and the growth in those markets is outpacing by what's happening in the U.S. The social networking service has attracted 1.1 billion users in foreign markets versus 200 million in the U.S. and Canada.
Netflix's Internet video service added 1.1 million international subscribers, nearly doubling the number it gained in the U.S during the April-June quarter. The company expects the trend to continue as Netflix enters six more European markets, including France and Germany, in September.
Corporate profits will probably need to keep rising to sustain the U.S. stock market's record-breaking run. The Standard & Poor's 500 index has already climbed nearly 8 percent this year, well ahead of its average pace historically, while analysts expect earnings to increase 8 percent this year. Low interest rates and an improving economy have helped to create a climate of optimism, said Brad McMillan, chief investment officer at Commonwealth Financial.
"Everything is going well right now," McMillan said. "That's what's driving the market up."
Like many other money managers, McMillan isn't convinced companies will be able to live up to investors' high hopes.
Overall sales have been slow, and profit margins are at record levels after years of cost-cutting. Those factors will make it tougher for companies to find ways to ratchet their earnings even higher.
The natural response for many companies? Look abroad because that's where most of the potential customers are. The U.S. population accounts for less than 5 percent of the world's roughly 7.2 billion people.
The U.S., though, still boasts the world's largest economy with a mass market of consumers who can afford more products and services than most other parts of the world. That means growth in other countries, especially in markets outside of Europe, Japan and South Korea, often isn't as lucrative as it is in the U.S.
Apple, which has always demanded premium prices, is discovering this as it sells more devices overseas. For instance, the iPhone's average selling price fell to $561 in Apple's most recent quarter, a 3 percent drop from a year ago and a 13 percent decline from $647 two years ago.
Google's growth in foreign markets outside Europe is one of the reasons that the company's average advertising prices have been falling for nearly three years.
Advertisers so far haven't been willing to pay as much to peddle their wares to consumers who don't have as much disposable income as people in the U.S.