What is the significance of the blessings on Ephraim and Manasseh?

In Genesis 48:15-16, Joseph brings his two sons, Ephraim and Manasseh, to Jacob for blessings. Jacob crosses his arms and blesses Ephraim, the younger boy, over Manasseh, the firstborn. This moment underscores God’s sovereign choice to bless the younger over the elder, reflecting a recurring biblical theme of divine justice and favor. Ephraim’s prominence in later Israelite history further emphasizes this elevation; he becomes a symbol of blessing and fruitfulness. This act not only establishes a precedent for God's choice and grace but also enriches the narrative of Israel's twelve tribes, showing God’s might in expanding His people through unexpected means.