Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Camino Real de Tierra Adentro' has mentioned 'Trade' in the following places:
Occurrence Sentence Text Source
By the year AD 1000, a flourishing trade network existed from Mesoamerica to the Rocky Mountains.
Spain at the same time maintained a monopoly on the products of its northern provinces, thus no trade occurred with the French colony of Louisiana.
At first, US merchants were arrested and imprisoned for bringing contraband into Mexican territory; however, the growing economic crisis in northern Mexico gave rise to an increased tolerance of this type of trade.