Multiple choice Which of the following was a direct effect of the trend in immigration after 1845? An increase in sectional tensions A major economic downturn An upsurge in nativist sentiment The collapse of the second party system Reveal answer Fill a bubble to check yourself C Correct answer Explanation The massive influx of Irish and German immigrants in the mid-19th century fueled the rise of the Know-Nothing Party and other nativist movements that feared the cultural and religious impact of these groups.