Because as the Roman Empire increased, they had more land. And Since they had a more variety of land, they had access to more products that other cultures had and they didn't. So they were able to have more trade with the newer products they had acquired as the empire expanded.
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The Mediterranean area was protected and encouraged by the Romans in order to create prosperity. This security of the Mediterranean Sea and elimination of the pirate predators enabled secure shipment of trade goods by the only efficient bulk transportation mode - sea cargo. Land transport for most goods was too costly over more than 100 km.
Trade was a major source of income for the Roman Empire. Specific sea routes were developed and trade roads built to make the process of transporting the trade goods easier. Different resources from different areas were needed throughout other parts of the empire, and other empires and societies traded, as well. The cooperation trade required brought the Roman world together.
it helped by adding more variety to their collection of useful objects other people found rare
A strong military and organizational abilities.
The western part of the Roman Empire fell under the strain of the invasions by the Germanic peoples, which was compounded by lack of internal unity, infighting and usurpations which rendered the Roman response to the invasions ineffective
The Mediterranean and Black Seas, the river valleys, the fertile lands.