What formed the basis of russia’s economy in the early 1900s?

Farming

Explanation:

By 1900 Russia was the largest grain exporter in the world. This made agriculture the basis of Russia's economy in the early 1900s. Almost a third of world exports came from the Russian Empire. World War I, the revolution and years of civil war led to the fall of the population of the fields and major interruptions in agricultural production. It was not until the second half of the 1920s that crops began to yield again.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers