But the deeper reason for America's logistics problems is a mounting shortage of skilled labour.
Moreover, the main reason for the increase in America's deficit with China is that since joining the World Trade Organisation in 2001, China has become an attractive place in which to assemble goods that were previously made elsewhere in Asia.
The other main reason for America's success was the creation of the Resolution Trust Corporation, also in 1989.
Yet the main reason for dissatisfaction with America's performance is not its extravagance: it is the numbers of uninsured (see article).
For much the same reason, America is also including duty-free privileges for certain imports from nearby bits of Indonesia in its planned deal with Singapore.
The main reason for the fall in the euro is that America's economy has been growing more rapidly than expected, whereas growth in the euro area has been sluggish.
These American patriots -- all the services that are represented up here today, all of you who are out there today -- you're the reason why America and our Armed Forces remain the greatest force for peace and security that the world has ever known.
WHITEHOUSE: The President delivers Remarks at Independence Day Celebration | The White House
That's the reason I'm running for president of the United States of America.
CNN: Transcript of Thursday's Democratic presidential debate
His frustration with America over this was the only political reason he gave for resigning.
For some reason, the novel is more highly regarded in Europe than America.
The reason the Shanghai crab seems uncontrollable is that there is no market for it in America.
One reason buybacks are so popular in America is that, for investors in the highest tax bracket, capital gains are taxed at more favourable rates than dividends.
One reason for confidence is that the company currently generates about 88% of its revenues from North America.
America is perfectly set up for extroverts, which is one reason the introverted intellectual class feels alienated and grouchy.
What this President believes is that he came here for a reason, which was to help America, to help change the direction of the country and help, specifically, given the circumstances, the dire circumstances that were here when he took office, to reverse a catastrophic economic collapse that was unfolding as he moved in.
One reason America is so keen on military dialogue, for example, is that the army is playing a bigger role.
Investors may have good reason to worry about America's future, but for now, at least, the world stilll revolves around America.
There is absolutely no reason for an allegedly civilized country, particularly one as wealthy as America, to pass the buck on providing health care for everyone.
Which leads to the second reason for pessimism: Africa's families are under greater strain than Asia's or Latin America's were when their demographic transitions first began.
Above all, Israel does not agree to a refereeing role for America, fearing, probably with good reason, that it might side with the Palestinians in interpreting the accords.
That's one reason this crisis is so much worse than the Mexican one: Latin America's exports only account for 4% of the world's total, whereas Asia's exports tip the scale at 25%.
And if share prices do fall further, or if demand in America slows abruptly for some other reason, effective remedial action is still possible: the Fed could cut interest rates (as it did, too much so as it turned out, after the stockmarket crash of 1987) or Congress could cut taxes.
"When America set aside the Arctic National Wildlife Refuge, we called it a 'refuge' for a reason, " he said.
Of the 420, 000 people whose main reason for visiting was the Olympics, 260, 000 were residents of European countries with 80, 000 coming from North America.
Sir David says the standard of life that can be bought in the city for a low salary is one reason why he and other colleagues have not taken much better-paid jobs in America.
The appetite for real estate among top tier of wealthy Americans remains strong, brokers said, for the same reason that it is attracting activity by international buyers in the former Soviet Union, Asia and Latin America: a growing confidence that New York luxury properties can provide a haven for wealth in a turbulent economy.
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