Step 1: Define national integration.
National integration means creating unity and solidarity among citizens despite differences of caste, religion, language, and region.
Step 2: Major problems in India.
\begin{itemize}
\item Communalism: Conflicts between religious communities weaken unity.
\item Casteism: The caste system creates discrimination and social division.
\item Regionalism: People often show loyalty to region over nation, leading to separatist movements.
\item Linguistic conflicts: Demands for recognition of languages sometimes create divisions.
\item Economic inequality: Rich-poor gap and uneven development generate dissatisfaction.
\end{itemize}
Step 3: Conclusion.
Thus, multiple socio-political and economic issues act as obstacles to national integration in India.
Final Answer: \[ \boxed{\text{Communalism, casteism, regionalism, linguistic and economic inequality}} \]
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