The Russian conquest Conquering of Siberia took place Process_start in the 16th and 17th centuries , when the Khanate of Sibir had become Becoming a loose political structure of vassalages that were being undermined Destroying by the activities of Russian explorers .

The first known Know explorers from the United States to go through Self_motion the Modoc country were John Charles Frémont together with Kit Carson and Billy Chinook in 1843 .