Answer: 1,000 Kilometers (620 miles)
Explanation:
Historically, it formed a land bridge that was up to 1,000 kilometres (620 miles) wide at its greatest extent and which covered an area as large as British Columbia and Alberta together,[2] totaling approximately 1,600,000 square kilometers (620,000 square miles).
Unlike previous federal policies, President Grants "peace policy" attempted to "<span>B:Provide fair and kind treatment to the tribes", since it was becoming more politically advantageous to treat them harshly.</span>
The California Gold Rush is the answer.