The people of Israel were conquered by Babylon because they broke their covenant with God through idolatry and injustice. The book of Haggai was written 70 years after this prophesied exile and recounts the experience of a small group of Israelites, led by Joshua and Zerubbabel, who had returned to rebuild Jerusalem.
Haggai
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Old Testament: Part 4
Hosea
The Northern Kingdom of Israel enjoyed moderate success from conquering neighboring kingdoms, but they were spiritually bankrupt on the inside. In the Book of Hosea, God sends Hosea to Israel during King Jeroboam II's reign to admonish them of their wrongs in perpetual idol worship and dependence on outside nations.