In the 20th century, Portugal engaged in two major conflicts: World War I and the Portuguese Colonial War (1961–1974). After the end of the Portuguese Empire in 1975, the Portuguese Armed Forces have participated in peacekeeping missions in East Timor, Bosnia, Kosovo, Afghanistan, Somalia, Iraq (Nasiriyah) and Lebanon. Portugal also conducted several independent unilateral military operations abroad, as were the cases of the interventions of the Portuguese Armed Forces in Angola in 1992 and in Guinea-Bissau in 1998 with the main objectives of protecting and withdrawing of Portuguese and foreign citizens threatened by local civil conflicts.
In what two major conflicts did Portugal engage in during the 20th century?
World War I and the Portuguese Colonial War

The nature of government under the Angevin monarchs was ill-defined and uncertain. John's predecessors had ruled using the principle of vis et voluntas, or "force and will", taking executive and sometimes arbitrary decisions, often justified on the basis that a king was above the law. Both Henry II and Richard had argued that kings possessed a quality of "divine majesty"; John continued this trend and claimed an "almost imperial status" for himself as ruler. During the 12th century, there were contrary opinions expressed about the nature of kingship, and many contemporary writers believed that monarchs should rule in accordance with the custom and the law, and take counsel of the leading members of the realm. There was as yet no model for what should happen if a king refused to do so. Despite his claim to unique authority within England, John would sometimes justify his actions on the basis that he had taken council with the barons. Modern historians remain divided as to whether John suffered from a case of "royal schizophrenia" in his approach to government, or if his actions merely reflected the complex model of Angevin kingship in the early 13th century.
What century were there contrary opinions expressed about the nature of kingship?
12th century

To protect crops from wind and drought, the Grain Intendant Zhao Guo (趙過) created the alternating fields system (daitianfa 代田法) during Emperor Wu's reign. This system switched the positions of furrows and ridges between growing seasons. Once experiments with this system yielded successful results, the government officially sponsored it and encouraged peasants to use it. Han farmers also used the pit field system (aotian 凹田) for growing crops, which involved heavily fertilized pits that did not require plows or oxen and could be placed on sloping terrain. In southern and small parts of central Han-era China, paddy fields were chiefly used to grow rice, while farmers along the Huai River used transplantation methods of rice production.
What was the name of the system that for growing crops that did not require plows?
pit field system