10.18 Why do people migrate?

Why do people migrate? !!!
push forces

civil war
environmental degradation
unemployment or underemployment
religious or ethnic persecution

pull forces

better economic opportunity
better health services
religious freedom
political freedom

Total Fertility Rate (TFR)
TFR: average number of children born per woman
for a population to remain the same, the TFR must be 2.1 
If it’s higher than 2.1: population rises
If it’s lower than 2.1: population falls

World TFR:      2.42  (it was 2.54 two years ago, 2.47 last year)
 
US TFR:          2.01 (it was 2.06 last year)
Nigeria TFR:   6.89 (developing nation)
Japan TFR:     1.40 (developed nation, aging population)

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1.17