One of the main challenges that the colonists faced was the

The new nation also faced economic and foreign policy problems. A huge debt remained from the Revolutionary War and paper money issued during the conflict was virtually worthless. In violation of the peace treaty of 1783 ending the Revolutionary War, Britain continued to occupy forts in the Old Northwest.

The settlers at Jamestown didn't have enough food. Because they felt unsafe moving away from the settled area, shortages of food were a big concern. Many colonists died from a lack of food. A third issue the colonists faced was weather.

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hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.