POPULATION

Lifespan: 1766-1834
Contributions:
- Recognized as the "Father of Demography."
- Proposed the concept of Exponential Growth in population.
- Introduced the ideas of Preventative Checks and Positive Checks on population growth.

Historical context of world population projections:
- 1800: Approximately 1 billion people
- 1930: Population reached 2 billion
- 1960: Population increased to 3 billion
- 1975: Reached 4 billion
- 1987: 5 billion; 1999 reached 6 billion; 2010 surpassed 7 billion.
- Projected that by 2050, the global population could reach approximately 11 billion.
Graphical representation of growth illustrates past and projections, showing a consistent increase, especially significant after the 1960s.

Current estimates of:
- World Population: 7-8 billion
- U.S. Population: Contains notable variations, with states like Florida having specific growth rates.
- Major urban centers (e.g., Orlando) and their populations; speed of growth in various regions (e.g., cities and MSAs).
World growth rate has reportedly tripled in the last 50 years.

Discussion on the problem of overpopulation and its implications.
Mention of megalopolises as examples of this imbalance in population distribution and urban spread.

Key factors contributing to population growth include:
- Increased life expectancy: Resulting from decreased death rates.
- Notable decrease in mortality rates, contributing to higher overall population.

Reasons why impoverished nations tend to have higher birth rates:
1. Motherhood is an important status: Societal norms place significant value on women being mothers.
2. Children viewed as blessings: Cultural perception of offspring as divine gifts.
3. Economic security for the elderly: Children expected to care for parents in old age.
4. Infant mortality rates: High infant mortality leads families to have more children to ensure some survive to adulthood.

Crude Birth Rate (CBR): 12
Crude Death Rate (CDR): 8
Migration patterns affecting population dynamics include:
- Westward movement
- Urbanization trends
- Suburbanization aspects
- Migration to the Sun Belt region.
The basic demographic equation as a tool to understand these dynamics:
- $Population = (Births - Deaths) + Migration$

Difficulty of accurate calculations due to varying models:
- Malthusian model predicts population doubling every 40-50 years.
- Other models suggest more conservative projections, estimating doubling in 70 to 100 years.
- The speed of population doubling remains uncertain but is taken seriously in demographic studies.

Demographic statistics on life expectancy:
- White females: 81
- White males: 78
- Black females: 78
- Black males: 72
Notable impact of external factors (e.g., COVID-19) causing a slight decline in average life expectancy.
Expected rebound to the average life expectancy of 80 years as pandemic effects diminish.

First conducted in 1790 and occurs every ten years.
Census methodology has evolved from simple forms to complex questionnaires requiring extensive data collection.
Participation in the census is mandatory by law.
2020 Census takeaways include:
- White population declined from 64% to 58%.
- Hispanic population increased from 15% to 18%.
- Life expectancy declined by two years.
- Notable social changes: fewer children and an aging population.

Definition: The structure of a population categorized by significant biological and social characteristics.
Primary tools for composition analysis include the Sex Ratio and Population Pyramids.

Sex Ratio Statistics:
- U.S.: 97
- Alaska: 132
- Washington D.C.: 88
- Urban areas: 94
- Rural areas: 104
Importance of population pyramids in visualizing age and sex composition of populations.

General features of Population Pyramids:
Illustrate both age and sex composition.
Reference to external resources for examples and explanations of different population structures.