First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic. It talks about the impact of immigrants on the welfare state. This is a broad overview of the subject. It does not use any pronouns or definite articles that need prior context. Why other lines are not chosen? Paragraph 2 starts with "It is also" which uses a pronoun that refers back to something not yet mentioned. Paragraph 3 starts with "In the early years" which is not general and needs context. Paragraph 4 starts with "But the issues" which uses a conjunction and refers to previous ideas.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion. It shows that the issues have a long history. The phrase "But the issues themselves are not new" gives a final thought on the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the discussion about immigrants. The phrase "It is also" shows that this is another point related to the first paragraph. This is a logical order.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it talks about what these discussions are about. The word "Inevitably" shows that it is a natural follow-up to the previous point. This shows a logical order.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows that the discussions are not new. The word "But" indicates a contrast, showing that while there are present-day dilemmas, there are also deeper historical issues.