As soon as civil strife was finished, however, Johnson and Seward took vigorous steps. An army under General Sheridan was sent to the border, and diplomatic pressure was exerted to convince France of the desirability of withdrawal. The occupation of Mexico was, apparently, not popular in France, and in the face of American opposition the French government sought a means of dropping the project. Accordingly the invading forces were withdrawn early in 1867, leaving the hapless Maximilian to the Mexicans, by whom he was subsequently seized and executed. While the Mexican difficulty was being brought to a successful outcome, the government of Russia offered to sell to the United States her immense Alaskan possessions west and northwest of Canada. Secretary Seward was enthusiastically disposed to accept the offer and a treaty was accordingly drawn up on March 30, 1867, providing for the acquisition of the territory for $7,200,000. The Senate, however, was far less inclined to seize the opportunity. Little was known about Alaska, and the cost seemed almost prohibitive in view of the financial strains caused by the war. Nevertheless the inclination to acquire territory was strong and there was a widespread desire to accede to the wishes of Russia who was understood to have been well-disposed toward the United States during the war. Under the operation of these forces the Senate changed its attitude and ratified the treaty on April 9, 1867. By this act the United States came into possession of an area measuring nearly 600,000 square miles, and stores of fish, furs, timber, coal and precious metals whose size is even yet little understood. It was not long before it became apparent that radical reconstruction had been founded too little upon the hard facts of social and political conditions in the South, and too much upon benevolent but mistaken theories, and upon prejudices, partisanship and emotion. It was inevitable that there should be an aftermath.