How were different civilizations connected through trade? what effects did trade have on these civilizations? do you think these effects were mostly positive or mostly negative? why?

Civilizations connected through trade first via trading tools with other nearby communities then it evolved into trading more goods such as foods crops and weapons. Then with boats this allowed technology and customs to travel for example Egyptian sculptures influencing Greek art work and the silk road. This helped humanity since a example of isolation was japan until the Miji Restoration. Humanity needs trade in order to communicate and get things they cannot make in their region of the world.

whose power in the senate is equal to the power of the speaker of the house?