Answer:
In the 1800s,the boundaries between the United States and Mexico changed drastically because of a war between the two countries.
The Earth's magnetic field is in a weakening stage right now.
because the bottom of the ocean is basically unreachable without the right equipment.
Began to be handled by modern technologies such as electronic system.
The 1970s was regarded as the Banking Revolution, in which the banks started to use modern technology such as Automatic Telling machine, debit and credit cards, phone banking, etc
