What does macroeconomics focus on trying to understand? check all that apply.
1) the changes that take place within an economic system as a whole
2) the individual interactions of producers and consumers
3) the challenges that economic systems face, such as inflation
4)specific models to understand patterns of change within an economic system
5)a nation’s economy in isolation, without considering how it integrates with other nations

the answers are 1,3,4

The macroeconomics focus on :

Macroeconomics deals with a larger-scale or general economic factors. This focus helps economists analyze the interest rates and national productivity of a particular economy in a specific country or place. Without macroeconomics the growth and targets of a particular economy will not be achieved.

Reason for other options are :

Thus , macroeconomics is an economic system as a whole .

For more query on macroeconomics refer , link

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.