While pointing out what a great country America is and implicitly comparing us to our competitors such as China, Obama made the following remark in his most recent State of the Union Address:
China is building faster trains and newer airports. Meanwhile, when our own engineers graded our nation's infrastructure, they gave us a "D."
We have to do better. America is the nation that built the transcontinental railroad, brought electricity to rural communities, constructed the Interstate Highway System.
The irony comes in using the transcontinental railroad as way to highlight how capable Americans are. The toughest part of building the transcontinental railroad was laying track across the Sierra Nevada's. The American workers were unreliable, so Chinese workers were brought in to do the job.
These workers quickly earned a reputation as tireless and extraordinarily reliable workers--"quiet, peaceable, patient, industrious, and economical." Within two years, 12,000 of the Central Pacific railroad's 13,500 employees were Chinese immigrants.
Almost 150 years ago Chinese workers were brought in to do a job that Americans weren't willing or able to do*. Obama's speech writers were trying to make a more general point about the value of infrastructure in general while touching on the feel good notion that Americans can accomplish anything. It is amusing to contrast this message with the idea that 145 years ago the Chinese work ethic, technological expertise and cheap labor were what drove this particular American success.
*This isn't the only way history seems to be rhyming if not repeating. In response to the Chinese competition there was rampant protectionism of white labor with the passage of the Chinese Exclusion Act to prevent Chinese immigration along with many local laws attempting to prevent Chinese labor competition from impacting white Americans. These discriminatory laws ultimately led to a Chinese boycott of American goods in 1905-1906.
Edit: There is more. Chinese laborers in the US were also known as better savers back then, as many of them were able to refrain from spending a large portion of their paycheck on alcohol.