The development of a number system which allowed for complex calculations is attributed to the 1. han Dynasty
2. Babylonian Empire
3.Egyptian Civilization
3.Gupta Empire

1. Han Dynasty

Explanation:

In ancient China, the Han dynasty is a great dynasty which exist between the period 206 BCE to 220 CE. In the period, great developmental strides where achieved ranging from agriculture, military conquest and equipment as well as education-especially in Mathematics.

In addition, the quality of life of its people improved greatly as well as the development of engineering equipment like the waterwheel and the water clock which is based of the application of complex mathematical calculations during its design.

not sure might be he acquired the entire oregon territory from great britain

that is probably something for you to answer