Ok so this looks very hard but i am so sorry but i cant help i just dont know how to do this.
Answer:
The Silk Road and other trade routes had become too dangerous, expensive and time consuming
Explanation:
Trade routes to Asia and the Middle East had become very dangerous for Europeans because non-friendly empires like Ottoman Empire and the Persian Empire were the middlemen between Europe and Asia.
For this reason, Europeans were pushed to explore alternative trade routes to Asia. In fact, Columbus idea was to sail west to find a new route to Asia, he never expected to land on a whole new continent.
The technological advance that allowed cities to expand outward are the forms of electric urban transportation. Electric urban transportation includes the mode of transportation that we are seeing today.
They embraced strikes as an effective way to make gains for workers.
