The judiciary, particularly in democratic nations, plays a pivotal role during periods of substantial ideological shifts. Courts, especially constitutional ones, interpret laws, and their decisions can either cement or challenge prevailing political ideologies. For instance, during the Civil Rights Movement in the US, the Supreme Court played a crucial role in dismantling racial segregation policies, notably in the landmark case Brown v. Board of Education. Similarly, in post-apartheid South Africa, the judiciary, guided by the new Constitution, shaped policies promoting equality and countering decades of racial discrimination. Thus, courts often serve as counterbalances or reaffirmers to legislative and executive branches during significant ideological transitions.

Globalisation, with its emphasis on interconnected economies and the proliferation of multinational corporations, has posed challenges to the sovereignty of nation-states. As economies become interlinked, countries often find their policy-making constrained by international agreements and standards. For example, membership in the World Trade Organization requires nations to adhere to established trade standards, sometimes superseding national interests. Similarly, financial institutions like the International Monetary Fund and World Bank often impose conditions on nations seeking financial aid, directing national economic policies. Additionally, the rise of multinational corporations means that large economies can exert influence on national policies, sometimes prioritising corporate interests over national ones.

The Industrial Revolution, characterised by rapid urbanisation and the growth of factory-based economies, had profound implications for the democratic participation of the working class. With the migration of workers to urban centres, there was an increased consciousness about workers' rights. This awareness led to the formation of labour unions and workers' parties. In countries like the UK, these movements eventually led to expanded suffrage, including for non-property-owning men. As the working class became more politically active, there was a push for policies that catered to their interests, such as better working conditions, shorter working hours, and better wages. The Industrial Revolution, thus, democratised politics by amplifying the voice and participation of the working class.

Foreign interventions during the Cold War were primarily driven by the ideological battle between the US and USSR. They often took the form of proxy wars, where the superpowers would support opposing factions in a third country, as seen in Vietnam, Korea, and Afghanistan. Economic tools like aid and sanctions were also employed strategically. In contrast, 21st-century interventions have been influenced by a wider range of factors, including concerns about terrorism, regional stability, and humanitarian crises. Modern interventions, such as in Libya or Syria, often involve coalitions of countries, and the rationale can vary from regime change to humanitarian assistance. While Cold War interventions were distinctly bipolar, 21st-century interventions reflect a more multipolar world with varied and sometimes overlapping interests.

The US's 'Melting Pot' ideology and Canada's multiculturalism policy present two distinct approaches to immigration and national identity. The 'Melting Pot' philosophy, popularised in the US, suggests that immigrants should assimilate into the dominant culture, thereby forming a cohesive and unified national identity. It essentially promotes the idea that various cultures will 'melt' into a single unified entity. In contrast, Canada's policy of multiculturalism encourages immigrants to maintain their cultural identities while also participating in the broader Canadian society. Canada recognises and celebrates the value of diverse cultures, ensuring immigrants maintain their distinct identities while contributing to Canadian society, leading to a more pluralistic and inclusive national ethos.