Shortly before this news,Jefferson had handed his personal secretary,Meriweather Lewis his instructions for the expedition of the Missouri River.On May 14,1804,the Lewis and Clark Expedition started out from St.Louis in search of the Pacific Ocean.
Two and a half years and 8,000 miles later the explorers returned to St.Louis and there’s a thunderous welcome from a grateful nation.Although the route never became widely used,it provided the impetus for the great western exploration movement.The search for America began.
By 1848,when Mexico ceded its claim to all US territories to the north of its present-day border,the United States had acquired the land westward from the Rockies to the Pacific Coast,north to the 49th parallel and south to the Rio Grande.This lawful possession convinced thousands of settlers to move westward in search of land.
【解题导语】 本文讲述了美国领土扩张过程中的几个重大事件。
9.Why was Jefferson’s message to Congress secret?
A.California is rich in gold nuggets.
B.There may be trouble with France.
C.It’s about a military expedition.
D.The Westward Expansion began.
解析:选B。细节理解题。文中第二段谈到the Mississippi River以西的领地当时由法国人控制,保密是为了避免冲突。
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