Final answer:
The Ottoman Empire in the 1400s and 1500s expanded its territory through conquests, bringing new wealth and people into the empire.
Step-by-step explanation:
The observation about the Ottoman Empire in the 1400s and 1500s is that the empire expanded its territory. The Ottomans engaged in conquests, which brought new wealth and people into the empire. They expanded into Europe, controlled shipping routes, and had a diverse empire that allowed for different languages, religions, and self-government as long as loyalty and taxes were maintained.