The key cause was economic hardship
An Automobile should be a possible answer i do hope this helps
Iron Joseph Paxton design the crystal palace
Answer: The US
backed out in financially helping Egypt build a dam, particularly the Aswan
High Dam. US offered to help Egypt build this dam but backed out of the deal
for unknown reasons. 90,000 Nubians/Egyptians were affected by relocation and
there were also a lot of artifacts that were moved to make way for this
development
Explanation: