Museums limited to local artefacts can boost a sense of national pride and unity. When local people visit traditional clothing or old documents, it can remind them of their shared values and roots. This in turn, can foster a sense of unity among citizens in a country.
Such museums can promote justice. Some artefacts were stolen or taken from other countries in the past wars. Keeping such objects is ethically and legally incorrect, and returning them to their origin countries can promote justice.
However, including other countries' artefacts can provide some advantages. International museums are more appealing to people who are interested in history. This means that such museums can attract a wider range of visitors and tourists. Consequently, this will boost local economy, when tourists spend money on accommodation, meals, and purchase souvenirs at local shops. Another benefit is the exchange of cultures. Visitors can learn about other countries' rich heritage and history, which broadens their knowledge and understand about the shared values or experiences. Consequently, such visitors might respect people of different background more.
In conclusion, in my opinion, museums displaying only local historical objects can promote a sense of national pride and unity among citizens. Nevertheless, I believe that, international museums can help boost the local economy and broaden visitors' horizons. Therefore, I am convinced that museums should not be confined to local relics.