Officially United States use the International System of Units.
Practically they use the old and obsolete British system with some non significant modifications.
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Tradition.
1945
We use the metric system to measure because the scientist all over the world use the metric system to measureThe metric system was developed in the late 1700's as a way to standardise measurements throughout Europe. For each type of measurement there is only one base measurement with the use of prefixes to adjust the measurement. For example, the base measurement for volume is a litre . If we have a thousand litres, it is referred to as a kilolitre, as the prefix kilo means one thousand. The most common metric base units are the litre(volume), gram (mass) and metre (length). Prefixes include kilo (1000), hecto (100), deca (10), deci (0.1), centi (0.01) and milli(0.001).I live in Australia and we use the metric system here as well.
The first standardized system of measurement was used by the ancient Egyptians around 3000 BC. They developed a system based on body parts such as the cubit and the palm for length measurements.
In the US, scientists and medicine primarily use the metric system of measurement, which is also known as the International System of Units (SI). This system is used for its consistency and compatibility with scientific research and global standardization.