Why did Jacob bless Ephraim instead of Manasseh?

Jacob blessed Ephraim instead of Manasseh because he perceived Ephraim as the younger son who would become greater and more influential. When Joseph presented his sons to Jacob, he positioned Manasseh, the firstborn, to receive the primary blessing. However, Jacob crossed his arms and placed his right hand on Ephraim, indicating that he would receive the superior blessing, symbolizing God's choice and the reversal of typical birthright customs. This act highlighted God's sovereignty in determining the future of the tribes of Israel.