Before Washington, DC, what city was the nation’s capital? Why was the District of Columbia created?
Who designed Washington, DC?
What buildings are housed in the current capital?
What’s a negative aspect of the current capital?

Philadelphia

Pierre Charles L'Enfant

U.S Congress (the House of Representatives and the Senate) are buildings housed in the current capital. 

A negative aspect of the current capital is negative working capital is when a company's current liabilities exceed its current [ assets. ]

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.

the answer is a new goverment.