Which international interests did the united states and russia share in the nineteenth century?

Question: Which international interests did the united states and Russia share in the nineteenth century?  

The U.S and Russia were once close friends. The reason and concept was simple: ''The enemy of my enemy is my friend.'' United States and Russia saw equal advantages in good relationship with each other due to their desire to offset the power of Britain in the 19th century. They were both particularly interested in offsetting Britain’s naval power.

Explanation: Though the U.S. didn't have a lot of military power, its mercantile prowess was growing and the U.S. and the Russian empire signed a commercial treaty in 1832 to formalize their alliance.  After its commercial treaty, Russia used American expertise to help build the St. Petersburg–Moscow railroad, as well as telegraph lines and America found a market for its sewing machines.

In the year 1853, the Crimean War began when Turkey fought back against Russian incursion. Turkey was later joined by Great Britain and France. Though America decided to stay out of Europe’s wars, it was determined to help Russia by sending American doctors to the front lines to help injured Russians. America also signed a trade agreement with Russia in order to send them supplies and even weapons. It was well known that the U.S. opinion was on Russia’s side. Due to this, dispatches from America were widely read among Russian elites and without American sympathies, Russia would have most likely felt alienated totally against all of Europe, all the civilized countries that were very important and powerful during that time.  

the answer is a. hope this