To determine which country has the highest population density among the given options (USA, India, China, and Japan), we can follow these steps:
### Step-by-Step Solution:
1. **Understand Population Density**:
- Population density is defined as the number of people living per unit area, usually expressed as people per square kilometer. The formula is:
\[
\text{Population Density} = \frac{\text{Total Population}}{\text{Total Land Area}}
\]
2. **Gather Population and Area Data**:
- We need to look at the total population and land area of each country:
- **USA**: Population ~ 331 million, Area ~ 9.8 million km²
- **India**: Population ~ 1.4 billion, Area ~ 3.29 million km²
- **China**: Population ~ 1.4 billion, Area ~ 9.6 million km²
- **Japan**: Population ~ 126 million, Area ~ 377,975 km²
3. **Calculate Population Densities**:
- Now, we calculate the population density for each country:
- **USA**:
\[
\text{Density} = \frac{331,000,000}{9,800,000} \approx 33.8 \text{ people/km²}
\]
- **India**:
\[
\text{Density} = \frac{1,400,000,000}{3,290,000} \approx 425.5 \text{ people/km²}
\]
- **China**:
\[
\text{Density} = \frac{1,400,000,000}{9,600,000} \approx 145.8 \text{ people/km²}
\]
- **Japan**:
\[
\text{Density} = \frac{126,000,000}{377,975} \approx 333.5 \text{ people/km²}
\]
4. **Compare Population Densities**:
- Now we compare the calculated densities:
- USA: 33.8 people/km²
- India: 425.5 people/km²
- China: 145.8 people/km²
- Japan: 333.5 people/km²
5. **Identify the Highest Population Density**:
- From the calculations, we can see that India has the highest population density at approximately 425.5 people/km².
### Conclusion:
- Therefore, the country with the highest population density among the options provided is **India**.
