Which is not an effective organizing principle for the study of history?
a. eras
b. major time periods
c. topics
d. wars
e. year-by-year accounts

d

Explanation:

long periods of time occur in between and important events may happen during these times

E. year-by-year accounts, as it would become too much information that would take up too much time if you studied every year of history in detail.

(hope this helps!)

answer: they arrived in new york.

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!