What type of immigrants were typically targeted for settlement in North Dakota during the expansion period?

The correct choice highlights the trend of encouraging settlement by attracting immigrants deemed desirable for the region during North Dakota's expansion period. The term “desirable immigrants” refers to those who brought specific skills, agricultural knowledge, and cultural attributes that were beneficial for developing the economy and communities in North Dakota.

During the late 19th and early 20th centuries, North Dakota sought immigrants from Northern and Western European countries, such as Germany, Norway, and Sweden. These groups were often considered desirable because they had backgrounds in farming, which aligned with the state's economic needs as it transitioned into an agricultural hub. The influx of such immigrants helped populate the region, establish farms, and contribute to the social and cultural fabric of North Dakota.

Other categories, such as skilled laborers, while also valuable, did not capture the broader scope of immigration policies aimed specifically at filling agricultural settlements. Temporary workers were not intended to settle permanently, and displaced persons typically referred to people fleeing conflict or persecution, a demographic not specifically targeted for settlement in the same way that groups viewed as desirable immigrants were encouraged to settle and thrive in North Dakota.