The two factors that contributed significantly to General Burgoyne's defeat at Saratoga are:
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Benedict Arnold's effective tactics in delaying the British army. Arnold played a crucial role in the American defense and was instrumental in leveraging terrain and engaging British forces effectively, which contributed to the overall American victory.
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General Howe's failure to follow through on the original plan. General Howe, who commanded British forces in the region, did not support Burgoyne as planned, choosing instead to pursue his own campaign in Philadelphia. This lack of coordination weakened Burgoyne's position and resources, making his defeat more likely.
The other two options, while they might have impacted the overall war effort, were not primary factors in Burgoyne's defeat at Saratoga.